Boring and cutting tool.



F S, SHIELDS. BORING AND CUTTING TOOL.

Airmen-1011 FILED MAY 23, 1913.

1 91225 86:83 Patentafl B66 29 1914-.

f BY/MWU inn e par-'2 oi this nnplientien l @FFICE.

FRANK S. SHIELDE, 531*" 311 JELAIID, F-1'16.

min i .21"

lien

.L Li

BGRZNG Ell? CUTTFFIETG n Zeal Dee.29,1914.

longitudinal. crosseamer shell; Fig. 6 1s 4 m iri m (11 (9091.00)): .a known ihet 1, FRANK S. Snmnns, citizen of the l niterl States residinei Cleveland. in the county or if Fnte of Ohio, have invented n certain and, useful Improvement in Boeing 12 L'. Tools, oi which the following is n clear, and exact lescripi'i llilkl i-o the accompanying n;

ini'eniion relates to boring and lrnewn as XBSUAQ- mil-ts by reference chemo the body or" the rennin! of hollow metallic shell axial, cylindrical reon ejn one of the ends this shell is reduced as at adjacent to the the recess 2 opens, the e body being traversed by hues er cutters ere emplo hen ages of employing ernm/ahl'e b evme it this character have long asiruch as such eonsirncion file sharpen of the same when in lei: or worn nnu the replacement of the same when lil'izlCQlL However, :1 great oh '{Uli to ihe rn'notical application this :1. has been the Cliiiieulty oi securing the a so to he rigiii and ininntall of Line Limles n'ligrh-z seine (lie: 1 52-0 the center l. and so that the l) bottom oi the hole.

i ended portion 3 to the new boil the wells of the shell len itmlinally extending, "a l slots 66 and in Zerl me blades or cutting i the form illustrated in 'i'e, each of theseblmle's ee ef tool steel having a hlmles in place v-'nri h ie. so siiunll at the H perm otherl the even ion of rntil' "lngz of zhe-hlnoes s' the -uel support of the hlei es so 'e e pair of spaced poin the same direction one dS116(l. he formed as n IIZBE m3 superioritv which 1' 31 bhe blade is prolonged out as ehe description proceeds. overhang the end of the suiting the entire wall of re and even the milling of t eperfiure in case the ends sharpened as illustrated in in addition the rearward v lvlne s is beveled us illusl e; iilin a direction opposite to that the drawings aeeompnnyin recess 2 is monntede supportand wheezing member illustrated sepa- \niloii View oi :1 com lete reiimer in Fig. .3, and consisting of :1 threadbtmw 35 1(ll1 l'.&il to fit the aperture 5 and provineu u; eeiziptezl to ii): the position of the blades. Preferably these supports Consist of lute grel enler ements 11 -17 formed upon the shank l6. pmifernhly of conical shape with r in El longitudinal, eentrnl. cross the same; l .1 cross then-earner tnlren upon the line f-i Fig. nnzi looking lil tlle direction of ihe axial threaded viper-r mring 1 not he rocked m; spy end of the blade, as the employment the we l :12 '4. Adjacent to the foriee of be present inaention i lfwwe each blade an undercut :1? a t ich s'. :vmerl. noone reentrant 1n- A5: a pair of maced supports I Mounted upon the threads 3 at the rear of ture. trated ln Fig. 9, the teeth on the different more dillicult to produce.

"3 so as to center 'the blades,

a slope similar tothat of the faces of the blades. The end of the stud is preferably formed witli'a wrench receiving recess 18, and both of the enlargements fit as shown in Fig; the thread pref-- snugly within the bore 2 erably being slightly loose. The distance between the enlargements l7-l7 is so chosen that their engagement with'the blades will hold the latter with their outer edges at the desired angle which may be either parallel or converging.

Surrounding the stud, 15 and resting agalnst the inner face of the web 4 is a. re-

r Zea-913101131 66; "upon the threaded-por tion3 oftliebody'is the securing ring 25" having at its forward edge the overhangin'g undercut portion 26 adapted to engage the inclined or beveled ends 13 of the blades.

this ring is a loclrnut 27 whereby the ring is secured in place. Both ring and nut are preferably formed with radial apertures 28 as illustrated in Fig. 1 for the reception of a spanner wrench. The walls of the recess 2 may, if desired, be formed with screw threads, as shown at 30 by means of which the tool can be secured to a shank or spindle.

In Fig. 9 I have illustrated a slightly modified form of tool, the blades having serrations in their edges so as to produce a screw thread when advanced into an aper- In case the device be made as illusblades will be arranged in gradually advancing order similar to. the pitch of the thread, and the blades will always be applied to the bod in the same order. In the case of the device illustrated in Figs. 1 to 7 inclusive, the arrangement of theblades will'ordinnrily be immaterial. Also in Fig. 9, Thai-c omitted the ring 20 formii'ig-the inner face of the web iupon an incline as shown at 21" for engagement with the rcentrant. inclines of the blades,-this arrangementis exactly the saint. in operation as that above described. though slightly Also I have shown the.enlm-gements carrici'l by the stem 17 as more protubcrances 17, 17 formed as surfaces of revolution but omitting the conical faces, this form operating substantially like the preceding, except that the small area of contact causes the device to the blades is. easily "wear more'rapidly than the first forni.'- Enlargements l 7'!,.;r-.17? fitting snugly in the bore of the reamer body maintamthe centersin-placqjwhilea screw 15* located i the aperture 5!:jof the web 4; adjustsand se-J cures'the supporting -member.'. Removal of is readily accomplished by screwing the stud lo iii-one direction or the the recess 18. Sharpening of the blades is effected by grinding their outer edges and wherefore the tigh'tness of -the fit of the blades within their slots'is not disturbed. 1

not their faces,

e narrowing ofthe blades as the consequence of such grinding. is taken .up by adjusting the stud 15f A -Reference has heretofr, been, made to the fact that the angle of, the faces 9-9 is different than that of the reentrant incline 11, the latter being more nearly perpendicular to the axis of the tool than the former. This arrangement is chosen to produce a construction which shall qop" ose the thrust of. the ring :25. and. also one w "ch shall withstand the inward pressure upon the blades incident to'the cutting operation,

were of exactly the If the faces 9 and 11 same inclination, it is obvious that there would be no resistance to the forward and inward movement of the blades except the contact of the edges of the blades either with the bottoms of the slots 6, the surface of the ring20, or the surface of the stud 15, the consequence being that the blades might easily become inclined to each other so as accidentally to cut a hole of a shape not desired. lVith the construction here illus' trated, the blades are supported against in ward movement entirely by the surfaces of the cones 1717, and against longitudinal I effected by unscrewing 'the'nut 27 and ring 25. Adjustment of the blades radially other by means of. a s'uitable'ltool inserted in r movement entirely by the face of the ring 20. So far as concerns this feature the face of the ring 20 might equally well be plane, but the undercut formation is re sorted to so as to prevent the falling out of the blades upon the removal of the tool from the work. In the p1'esent,-cmhodi ment, I haveillustrated the surface ll as formed with an angle of substaiitiall. forty-five degrees, and the surfaces .with an angle of substantially thirty demany other modifications in matters of tie.

nally extending radial slots intersecting:

said here, said body also hai ing an internal inclined shoulder at its forward end, of a blade or cutter for each slot and adapted to project radially outside of said holly. the inner edge of each blade or cutter ha ing a rccntrant incline for engagement a" said shoulder and also with a plurali spaced portions incl ned Hi the sanie niection as'saidfirst incline, the e blade or cutter farthest from said reentrant incline being tapered in the oppo direction. a pair of spaced supports r: connected together and adapted to engage said spaced inclined portions, means securing said supports adjustahly within said. body, and a securing ring carried ll) said body and having an (Wei-hanging portion adapted to engage the tapered ends of said blades or cutters.

2. In a tool of the character d; the combination with a body l axial bore and a plurality of nally extending radial slots said bore. said body also haying an internal inclined shoulder .at itsl'oruard end adjarent to and Within said slots, of a blade or cutter for each slot and adapted to project radially outside of said hotly. the inner edge oi each blade or cutter having a re ntrant incline for engagement with t ioulder. and also having spaced portions inclined in the same direction as said first. incline. the angle of inclination of said first incline oeing greater than that of said second incline, a pair of spaced supports rigid together and adapted to engage said s iced inclined portions. means for securing said supports adjustably within said body, andmeans carried by said body and adapted to engagefthe rearward ends of said blades or cutters "and force saidi'eiintrant incline against said shoulder.

3. In a tool of the character described. the combination. with a body l'iavim; an axial bore and a plurality (if longi adinalh extending radial slots intersecting: said here. said body also having; an internal inclined shoulder at its forward end no} rent to and within said slots. of a llltllt cutter lor ea h slot and adapted to project radially outside of aid body. each hladc or cutter being formed adjacent to its for \xfa'rd end with an inclined portion for cu 'nageuicut with said shoulder. and upon its inner edge with a ilurality of spaced cui: am :rst incline. and the rearward end at hl e or cutter heir tapered in the opposi 'on, a, pair of spaced 5 ports d together iind al ed to eng' s l. inclined norti said snugly a" in core, to ecnrir said supports adjustahly along said here. and a earing ri carried said body an having an eve hanging p rtion adapt the tapered e ids of said hlades or cutters.

in a tool of the character described, the emuhination ii' a hotly having an axial bore and a plurality of lo: 'tudinally tending radialuilots intersec. 1g; said he said bod also having an undercut incl. 18d shoulder at its forward end within and ad cent to said slots. of a blade er en r to? rarli slot, and adapted project radially outside of said body, each blade or cutter 'ng termed adjacent to its forward. end with an inclined portion for engagement wit said shoulder, and also ha wing spaced port ons inclined in the same direction as said. lin incline, the of first in. line lie-n57 greater than that of S21v3. other inclines and rearward end of each hiace or cutter being tapered in the opposite direction. a pair of spaced supgcrs formed surfaces of l'ClCll ion rig" lly connecte toand adapted to enga e said spaced portions, means for securing said 4 adiustahly u'ithin'said body with ling with that of said body. 1; carried by said body and. raging portion adapted to Mill :1 5 ha ring engage the tapered rearwawl ends of said lilaal a or cutters.

.i. a ool of the character (l ...-I(?i' l)6(l, the

' "'1 with a bony inning an axial here and a plurality of longit-iulinally exding: radial slots intersecting said vhere ins: through the tora'ard end of .1- body. said hmly also having an undercut inc -ed shoulder at its forward end acen't to said. slots. o

a each slot and dually outside of said bod earl: hia il or cutter being x d at a po removed from forward end with a reentrant incline engaging with and also with a plurality f spaced portions 1 the same direct on as said "irstiin inc. the a..

meznlier slidablv fitted Wit in said bore an" ha ring a pair of spaced enlar .ents engaging said spaced inclined portions. means for ;--c -urin;r said saipporting ineniber adjustahl}; within said holly. and means carried by said sa id shoulder,

' axial with said bore and there being an inbody and engaging the tapered rearward ends of said blades or cutters, whereby said blades are forced inwardly against said spaced enlargements.

6Q In a tool of the character described, the combination, with a body having an axial bore, and a plurality of longitudinally ex- 'tehding radial slots intersecting said bore, said body having an inclined shoulder at its forward end within and adjacent to said slots and also having a threaded axial aperture, of a blade or cutter for each slot and adapted to project radially outside of said body, each blade or cutter being formed adjacent to its forward end with an inclined portion for engagement Withsaid shoulder and upon its inner edge with other spaoed inclined portions, the rearward end of each blade or-cutter being tapered in a direction opposite to the direction of said first inclines, a threaded stud for said aperture and having a pair of spaced enlargements thereon formed as surfaces of revolution and adapted to engage the supporting portions of said blades or cutters, a portion of said stud being formed for engagement with the interior of said bore, and means carried by said body adapted to engagethe tapered onds of said blades or cutters and force the same in 'the direction of said shoulder.

T. In a tool of the character described, the combination, with a bodv having an axial bore opening through its rearward end and a web traversing said opening at its forward end, said web having a threaded aperture coclined annular shoulder coaxial with said aperture inside the sin-lace of said bore, the wall of said body being formed with a pluraiity of longitudinally extending radial slots opening through its forward end and extending to-a point adjacent to but spaced i'i'om its rearward end, of a blade or cutter for each slot and adapted to project beyond said body both radia iv and longitudinally,

the inner edge of bach blade or cutter having a reintrant incline for engagement with said shoulder and also having internal spaced sup mrting portions, a threaded stud for said aperture and having a pair of spaced enlargements thereon formed as surfaces otrevolution and adapted to engage the supporting portions of said blades or cutters, and means carried by said body and. engaging the rearward ends of said blades or cutters for forcing said reiintrant inclines against said shoulder.

8. in a tool of the character described. the wmbination. with a body having fill-:lXlill boriextending from its rearward end to a point short of its forward end, such forward end being formed with an axial threaded aperture, the wall of said body being formed with'a plurality of longitudinally extending radial slots terminating short of the rearward end thereof and extending through the forward end outside of said aperture and said body having an inclined shoulder coaxial with said threaded aperture inside of said slots, of a blade or cutter for each slot and adapted to prodirection opposite thereto, a threaded stud for said aperture and having a pair of spaced supporting portions thereon formed as surfaces of revolution adapted to engage the supporting portions of said blades or "cutters, and a securing ring carried by said body and having an overhanging. portion adapted to engage the tapered rearward ends of said blades or cutters.

9. In a tool of the character described, the combination with a bed having an axial. cylindrical bore, a portion of which is constricted, the wall of said body being formed with a plurality of longitudinally extending radial slots terminating short of the rearward end thereof and extending through the forward end, and said body having an inclined shoulder inside of' 'gaid slots, of a blade or cutter for each slot"*and having an inclined portion for engagement '1tll said shoulder and also with spaced suppm'ting portions, the end of each blade or cutter farthest from said first incline being tapered in a direction opposite thereto,

a supporting member slidably mounted in said bore and haying a pair of spaced en-,

largements thereon adapted to engage the supporting portions of'said blades or cutters,. threaded means traversing the constricted portion of said bore whereby said supporting member is adjusted and held in plate, and means carried by said body and adapted to engage the tapered ends of said blades or cutters to force the same toward said shoulder.

10. In a tool of the character described, the combination, with a body having an axial bore extendin from its inner end to a point adjacent to ut spaced from its forward end, the forward end of said body having an axial threaded aperture and an internal annular shoulder between said aperture and the inner wall of said bore, the 'all of said body being formed with a plurality of longitudinally extending radial slots extending from a point removed from the rearward end thereof past said shoulder, of a blade or cutter for each slot, the inner edge of each blade or cutter having a reentrant incline adjacent to said shoulder, and also having spaced portions inclined in the same direction as said first 

